150 UNITED STATES AND MEXICAN BOUNDARY. 
Іромвл MURICATA (Cav. lc. 5, p. 52, t. 418, f. 2, ex Choisy, l. c. p. 353): glabra; radice 
tuberosa globosa; caule prostrato ; foliis subsessilibus palmatis, lobis 5-7 integris anguste 
linearibus vel lobo medio lineari-lanceolato; pedunculis unifloris brevibus (2-4 lin.); sepalis 
lanceolatis obtusiusculis, dorso muriculato | corolla tubulosa (unciali purpureo-coccinea) breviter 
5-loba; capsula glabra. Sonora, Mexico; Thurber, September. (Хо. 1616, Wright.) Root 
a roundish tuber from half an inch to an inch or more in diameter. Stem a span long, slender. 
Leaves about an inch long, most of the segments scarcely half a line wide. Corolla almost 
trumpet-shaped. | 
IpoM@A LEPTOTOMA (n. sp.): annua; caule prostrato (vix volubili) glabro; foliis petiolatis 
pedatis glabriusculis, lobis 5—7 linearibus ciliolatis integris, lobo medio elongato; pedunculis 
1-2-floris petiolo multo longioribus ; pedicellis calycibusque hispidulis ; sepalis lanceolatis, apice 
attenuatis acutissimis ; corolla campanulato-infundibuliformi (14 unciali. Near Santa Cruz 
valley, Sonora, September; Thurber. (No. 1614, Wright.) Stem branching from the root; 
the branches 1-1} foot long, somewhat twining.  Petioles 2-4 lines long. Leaves deeply 
divided in a pedate manner, the lobes scarcely a line wide, the middle lobe usually almost twice 
the length of the lateral ones ; uppermost leaves often entire. Peduncle 1-2 inches long ; the 
pedicels scarcely half an inch. Sepals about 4.lines long. Corolla with a bright reddish 
. purple limb and a pale tube. 
_1РоМ‹ЕА FASTIGIATA, Sweet ? ; Choisy, L. c. p. 380? Оп the banks and in the bed of the San 
Pedro, Western Texas ; барбара, (fl. & fr.) ; Bigelow. Seems to differ in the sepals being 
only mucronate and scarcely aristate. 
EvoLvuLUS ALSINOIDES, Linn. Sp. 892, Choisy, l. c. p. 447. Rocky hills, near Camp Bache, 
July; Bigelow. Corallitas, Chihuahua, Aug. ; and Sonora, Mexico; Thurber. Хо. 1619, 
Wright, is a form with narrow leaves. 
Var. HIRTICAULIS: caule hirsuto, pilis longis patentibus; foliis ovato-oblongis, obtusiusculis. 
Brazos, San Jago, Texas, and on the Rio Grande near the San Pedro river, May—September; | 
Schott. Western Texas, Wright. Monterey, Mexico; Dr. Edwards. i 
Var. ANGUSTIFOLIA : caule hirsuto, pilis sparsis longis patentibus ; foliis lineari-lanceolatis, 
acutis. Near the Great Cañon of the Rio Grande, August; Parry, 
EvoLvULUs? OVALIFOLIUS (n. sp.): undique velutino-sericeis ; caule prostrato e basi ramo- 
sissimo ; foliis ovatis (pollicaribus 6-8 lin. latis) obtusiusculis crassiusculis, basi rotundatis vel 
subcordatis ; floribus solitariis axillaribus brevissime pedicellatis ; sepalis late ovatis mucronatis ; 
eapsulis monospermis. On the Rio Grande, below San Carlos, October; Parry. The specimens 
are in fruit only. 
EvOLvULUS HOLOSERICEUS 8 OBTUSATUS, Chois. l.c. Е. sericeus, Nutt. Gen. 1, p. 114, non Swartz. 
E. discolor, Benth. Pl. Hartw. p. 6. Rio Grande, near the San Pedro river, and near Yorktown, 
October ; Schott. A more densely cespitose form, with shorter branches, occurs near the Copper 
Mines, June; Bigelow. Monterey, Neuvo Leon; Dr. Edwards.  Cerralbo; Gregg. The 
pubescence, as in the next species, is reddish, at least in dried specimens ; the peduncles are only 
one-flowered ; the sepals are scarcely two lines long, and the leaves are often more than an inch 
in length. It may prove to be a distinct species. "The peduncles of the early flowers are some- 
times nearly as long as the leaves. 
EvoLvuLUS ARGENTEUS, Pursh, Fl. 1, p. 187 ; Choisy, l. c. Е. pilosus, Nutt. Gen. 1, p. 174, & 
in Trans. Amer. Phil. Soc. n. ser. 5, p. 195, non Lamarck. E. Nuttallianus, В, £ Schult. 
Gravelly hills, near Rock Creek and Van Horne's Wells, June—July; Bigelow, Wright. 
Copper Mines, N. Mexico; Thurber. Chihuahua; Gregg. It is No. 668 of Fendler's N. Mexico 
